Steam-boiler of the vertical-water-tube type.



H. WILKINSON.

STEAM BOILER OF THE VERTICAL WATERTUBE TYPE.-

APPLICATION FILED DEC.3, 1914.

1 1 52,135. Patented Aug. 31, 1915.

2 SHEETS-SHEET I.

FIG-1 h F3653 at M 1AAWMM \NVENTOE.

H. WILKINSON.

STEAM BOILER OF THE VERTICAL WATER TUBE TYPE.

APPLICATION FILED DEC-3.1914.

1 1 52., 1 35.. Patented Aug. 31, 1915.

2 SHEET$-SHEET 2.

CDLUMBXA PLANOGIZMH cu., WASHINGTON. D. c.

TED s i e PATENT QFFIQE HENRY WILKINSON; ornnarronn, con nnc'rronrghssrenoa To EPHRAIIVD WILKINSON, or sameness; comvncrrcun sr nmvnBorLER'0F"T1::sfvERTrc nwmsmcss myrsi;. i

To all "whom it may, concern if Be it known-that I, HENRY Wninmson, acitizen of the United States; residing at 14:1 Whitney street,,Hartford,in the county of Hartford and State of Connecticut, have inventedcertain new and useful Improvements in. Steam-Boilers of'theVertical-Water-Tube Type, of which the following is a specification.

This invention relates to improvements in steam boilers of the verticalwater tube type. Heretofore such boilers have been construct ed "with anupper andlower drum connected by a series of tubes, set vertically andex-" panded into the heads of the drums. In order to get sufficientheating surface for practical operation it is necessary to make suchtubes of considerable length, which in turn necessitates perforatingthetop head of the upper drum with aseries of handholes in order that thetubes may be set 111 place. Furthermore, head room equal to the lengthof the tubes must be available above the boiler in order that new tubesmay be in stalled.

The objects of this invention are to construct a boiler in which thosedisadvantages will be eliminated and which shall embody certain novel,useful and valuable features hereinafter described.

The essential features of this invention consist in placing a centerdrum between the upper and lower drums, thus cutting the tubes into twoseparate banks, each bank containing tubes of different diameter.

The detailed construction and advantages of this design are hereinafterdescribed.

In order that my said invention and the manner of carrying same intoeffect or practice, may beproperly understood I have hereunto appendedtwo sheets of explanatory drawings in which- Figure 1 is an elevation ofthe boiler proper, showing the novel features of this invention. Fig. 2is a sectional elevation of the boiler set in brick as it would be inusual practice. Fig. 3 is a section to an enlarged scale showing thecenter drum with the different size tubes expanded into the heads.

Referring to the drawings: The usual upper and lower drums a and b havetubes 0 and cl expanded into the heads 6 and f as shown. A center drum gis interposed, preferably midway, between upper and lower drums at and 6thus cutting the tubes Specification or rehearsals. pa el l a au 1, 915;Application filed. December 3, 1914. ssria i irb. 875,268.?

into two separate banks'asshown'at c and" d. The tubes-c 'infltheiupperbank are of larger diameter than the'tubesd-in the flower bank so thatthe tubes 03 can pass through the tubes 0 asshowzr in Fig. Theiuppendrum a is made slightly longer" than the tubes so that the lattercah-fbe' entered proper location and dropped through the head intoplacei In removing" one: of the tubes at in the lower bank, the" beadingis cut off and y the tube pulled or pushed 7 through the"'cen'ter" drumand up" through one ofthe tubes in the upper bank into the upper drumand out through manhole h. A new tube is replaced by reversing theseoperations.

The tube holes in the heads of all drums are drilled co-axial so thateach tube in the lower bank is directly under a correspond ing tubeinthe upper bank. Entrance is made into each drum through manholes h, iand j. A. baflie plate is, shown in dotted lines in Fig. 3, constructedin sections may be fitted in the center drum to facilitate circulationof the water. The usual bafiies Z are provided to guide the passage ofthe gases.

It will be seen from the above description and with reference to theaccompanying drawings that the cost of renewing a tube in this type ofboiler is considerably less than in the type of boiler at present inuse, where the tubes are more than twice the length of the tubes in myinvention. Furthermore, the amount of head room or clearance re- 7quired above the boiler is less than onehalf that required with theboilers at present in use. When the boiler is placed in a separateboiler house this means a great saving in cost, time and material as thebuilding would not require to be built so high. If the boiler is placedin a building already erected it means a saving in space which can tofeed'tlie lower of tubes, thatth'ere is less liability of the waterevaporating'out of the tubes nearest the fire so quickly that the watercannot circulatefast enough to supply these tubes so that they areburned, The-tubes in theupper bank "beinglarger than thetubes in thelower bank assists the additional heat absorbed on its upward pasa e.-Th nter rum ery. en a om a c nom -s an p a e ap tion in theirontof-thelower bank of tubes, nearest the grates, is greatlyaccelerated by the short travel of the steam globules formed within each7 individual tube, which. willdischarge vinto the center drum, and jfron there findthe passage of least resist anceto theupper drum. The tubesare more easily cleaned, being shorter than those at present inuseandthe operation of the tube 7 l-Iaving thus described my invention Iclaim Ina vertical water tube boiler the combination of an upper,'centerand lower drum,

4 a series of tubes connecting the upper drum circulation, asthe volum'eof water ascend ing, ezgpandsfas it ascends by reason of the L to thecenter drum and a second series of tubes connecting the center drum tothe lower drum, the second series of tubes being of smaller diameterthan the first series and adapted topass through the first series substantially as and for the purposes herein set forth.

Intestimony whereof I ailix my signature in the presence of twowitnesses.

HENRY WILKINSON.

Witnessesi Q NEIL M DO ALD,

SA UE 'PUTNAM.

Copies of this patent maybe obtained for five cents each; by addressingthe Commissioner of Patents,

Washington, I). G.

